The influence of spacing of blasting holes with same detonation delay on the maximum blasting vibration velocity is calculated and analyzed by numerical simulation and field test, taking Yananlu Station on Line 2 of Qingdao Metro side crossing building No. 166 for example. The results show that: 1) The influence of spacing of blasting holes with same detonation delay on the maximum blasting vibration velocity is not obvious when the width of excavation crosssection within 6 m. 2) The reduction of blasting vibration velocity induced by detonation of adjacent blasting holes is faster than that induced by detonation of spaced blasting holes, i.e. the accumulated damage of building induced by detonation of adjacent blasting holes is smaller than that induced by detonation of spaced blasting holes.